15655397 has 4 divisors (see below), whose sum is σ = 16019520. Its totient is φ = 15291276.

The previous prime is 15655379. The next prime is 15655427. The reversal of 15655397 is 79355651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15655397 - 2⁶ = 15655333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15655337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181997 + ... + 182082.

It is an arithmetic number, because the mean of its divisors is an integer number (4004880).

Almost surely, 2^15655397 is an apocalyptic number.

It is an amenable number.

15655397 is a deficient number, since it is larger than the sum of its proper divisors (364123).

15655397 is an equidigital number, since it uses as much as digits as its factorization.

15655397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364122.

The product of its digits is 141750, while the sum is 41.

The square root of 15655397 is about 3956.6901571895. The cubic root of 15655397 is about 250.1620123187.

The spelling of 15655397 in words is "fifteen million, six hundred fifty-five thousand, three hundred ninety-seven".